Maybe, in a couple of years, javascript (or any language like coffescript that compiles to javascript) will fit your needs, especially regarding the control flow problem.

Here's an excerpt of a blog post (http://blog.mozilla.com/dherman/2011/01/30/proper-tail-calls...) from a research engineer at Mozilla Labs who works on the new ECMAScript standard:

  >Having an officially guaranteed tail call mechanism   
  >makes it possible to compile control constructs like 
  >continuations, coroutines, threads, and actors. And, 
  >of course, it’s useful for compiling source languages 
  >with tail calls!

Of course, it is a long way to go until one is able to use these features. So, for now, you are better off to look somewhere else for your specific needs.